<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>css盒模型</title>
<style type="text/css">
	.out{
		width:450px;
		height:50px;
		background-color:rgb(211 211 211);
		margin:10px auto;
		border:50px solid red;
		padding:10px;
	}
</style>
</head>
<body>
	<div class="out">
		<p align="center">最接近标记符内容的是填充，接下来是边框，然后是边界。</p>
	</div>
</body>
</html>